package gitcmd

import (
	"context"
	"path/filepath"
	"testing"
)

const (
	wAuthor      = "Alice"
	wAuthorEmail = "alice@example.com"
)

func TestCreateOrUpdateFile_NewFile(t *testing.T) {
	f := newFixture(t)
	res, err := f.repo.CreateOrUpdateFile("main", "docs/guide.md", "# guide\n", "add guide", wAuthor, wAuthorEmail, "")
	if err != nil {
		t.Fatalf("CreateOrUpdateFile: %v", err)
	}
	if res.Commit.ID == "" {
		t.Fatal("empty commit sha")
	}
	if len(res.Commit.Parents) != 1 || res.Commit.Parents[0] != f.c5 {
		t.Errorf("parents = %v, want [%s]", res.Commit.Parents, f.c5)
	}
	blob, err := f.repo.GetBlob("main", "docs/guide.md")
	if err != nil {
		t.Fatalf("GetBlob: %v", err)
	}
	if blob.Content != "# guide\n" {
		t.Errorf("content = %q, want %q", blob.Content, "# guide\n")
	}
	tip, _ := f.repo.refSHA("refs/heads/main")
	if tip != res.Commit.ID {
		t.Errorf("main tip = %s, want %s", tip, res.Commit.ID)
	}
}

func TestCreateOrUpdateFile_UpdateExisting(t *testing.T) {
	f := newFixture(t)
	res, err := f.repo.CreateOrUpdateFile("main", "README.md", "new content\n", "update readme", wAuthor, wAuthorEmail, "")
	if err != nil {
		t.Fatalf("CreateOrUpdateFile: %v", err)
	}
	blob, _ := f.repo.GetBlob("main", "README.md")
	if blob.Content != "new content\n" {
		t.Errorf("content = %q, want %q", blob.Content, "new content\n")
	}
	tip, _ := f.repo.refSHA("refs/heads/main")
	if tip != res.Commit.ID {
		t.Errorf("main tip = %s, want %s", tip, res.Commit.ID)
	}
}

func TestCreateOrUpdateFile_ExpectedSHAMismatch(t *testing.T) {
	f := newFixture(t)
	_, err := f.repo.CreateOrUpdateFile("main", "x.txt", "x\n", "x", wAuthor, wAuthorEmail,
		"0000000000000000000000000000000000000000")
	if err == nil {
		t.Fatal("expected error on expectedSHA mismatch, got nil")
	}
}

func TestCreateOrUpdateFile_EmptyRepoFirstCommit(t *testing.T) {
	bare := filepath.Join(t.TempDir(), "empty.git")
	if err := InitBare(context.Background(), bare); err != nil {
		t.Fatal(err)
	}
	repo, err := OpenRepository(context.Background(), bare)
	if err != nil {
		t.Fatal(err)
	}
	res, err := repo.CreateOrUpdateFile("main", "README.md", "first\n", "initial", wAuthor, wAuthorEmail, "")
	if err != nil {
		t.Fatalf("CreateOrUpdateFile on empty repo: %v", err)
	}
	tip, _ := repo.refSHA("refs/heads/main")
	if tip != res.Commit.ID {
		t.Errorf("main tip = %s, want %s", tip, res.Commit.ID)
	}
	if len(res.Commit.Parents) != 0 {
		t.Errorf("root commit parents = %v, want empty", res.Commit.Parents)
	}
	blob, _ := repo.GetBlob("main", "README.md")
	if blob.Content != "first\n" {
		t.Errorf("content = %q, want %q", blob.Content, "first\n")
	}
}

func TestDeleteFile(t *testing.T) {
	f := newFixture(t)
	res, err := f.repo.DeleteFile("main", "src/main.txt", "remove main.txt", wAuthor, wAuthorEmail, "")
	if err != nil {
		t.Fatalf("DeleteFile: %v", err)
	}
	tree, err := f.repo.GetTree("main", "")
	if err != nil {
		t.Fatal(err)
	}
	if containsStr(treeNames(tree), "main.txt") {
		t.Errorf("src/main.txt still in tree after delete")
	}
	tip, _ := f.repo.refSHA("refs/heads/main")
	if tip != res.Commit.ID {
		t.Errorf("main tip = %s, want %s", tip, res.Commit.ID)
	}
}

func TestCreateOrUpdateFileViaTempRepo_NewFile(t *testing.T) {
	f := newFixture(t)
	res, err := f.repo.CreateOrUpdateFileViaTempRepo("main", "via-temprepo.md", "hello\n", "add via temprepo", wAuthor, wAuthorEmail, "")
	if err != nil {
		t.Fatalf("CreateOrUpdateFileViaTempRepo: %v", err)
	}
	blob, err := f.repo.GetBlob("main", "via-temprepo.md")
	if err != nil {
		t.Fatalf("GetBlob: %v", err)
	}
	if blob.Content != "hello\n" {
		t.Errorf("content = %q, want %q", blob.Content, "hello\n")
	}
	tip, _ := f.repo.refSHA("refs/heads/main")
	if tip != res.Commit.ID {
		t.Errorf("main tip = %s, want %s", tip, res.Commit.ID)
	}
}

func TestCreateOrUpdateFileViaTempRepo_EmptyRepoFirstCommit(t *testing.T) {
	bare := filepath.Join(t.TempDir(), "empty.git")
	if err := InitBare(context.Background(), bare); err != nil {
		t.Fatal(err)
	}
	repo, err := OpenRepository(context.Background(), bare)
	if err != nil {
		t.Fatal(err)
	}
	res, err := repo.CreateOrUpdateFileViaTempRepo("main", "README.md", "first\n", "initial", wAuthor, wAuthorEmail, "")
	if err != nil {
		t.Fatalf("CreateOrUpdateFileViaTempRepo on empty repo: %v", err)
	}
	tip, _ := repo.refSHA("refs/heads/main")
	if tip != res.Commit.ID {
		t.Errorf("main tip = %s, want %s", tip, res.Commit.ID)
	}
	if len(res.Commit.Parents) != 0 {
		t.Errorf("root commit parents = %v, want empty", res.Commit.Parents)
	}
}

func TestDeleteFileViaTempRepo(t *testing.T) {
	f := newFixture(t)
	res, err := f.repo.DeleteFileViaTempRepo("main", "src/main.txt", "remove via temprepo", wAuthor, wAuthorEmail, "")
	if err != nil {
		t.Fatalf("DeleteFileViaTempRepo: %v", err)
	}
	tree, _ := f.repo.GetTree("main", "")
	if containsStr(treeNames(tree), "main.txt") {
		t.Errorf("src/main.txt still in tree after delete")
	}
	tip, _ := f.repo.refSHA("refs/heads/main")
	if tip != res.Commit.ID {
		t.Errorf("main tip = %s, want %s", tip, res.Commit.ID)
	}
}